Charging unit



FIG. 1 is a perspective front view of a charging unit showing our new design;

FIG. 2 is a perspective rear view of FIG. 1; and

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a side view thereof.

The broken lines showing portions of the charging unit in the drawings are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM We claim the ornamental design for a charging unit, as shown and described. 